Finding the Fourth Proportional to 13,142.70, 18,136.86 and 7,174.37

Step by Step Solution

1. Step 1: Write the proportion equation
   13,142.70 : 18,136.86 = 7,174.37 : x
2. Step 2: Convert to fraction form
   13,142.70/18,136.86 = 7,174.37/x
3. Step 3: Cross multiply
   13,142.70x = 18,136.86 × 7,174.37
4. Step 4: Simplify right side
   13,142.70x = 130,120,453.59
5. Step 5: Solve for x
   x = 130,120,453.59/13,142.70
6. Step 6: Final answer
   x = 9,900.59